Lubricating apparatus



A118 27, 1935- J. BYsTRlcKY LUBRICATING APPARATUS Filed June 27, 1932 2 Sheets-Sheet. l l

@Man

NMN

www @N @N bmw N- MwN @N ug- 27; 1935- n J. BYsTRlcKY v2,012,923

LUBRIGATING APPARATUS Filed June 27, 1932 2 Sheets-Sheet 2 Patented Aug. 27, 1935 Application June v27, 1932, serial No, '619,361 L A My invention relates generally to lubricating ,.apparatus, and more particularly toy improvements in portable manually operated high` pressure grease guns. f

It is an object of myinvention -to provide an f improved grease gun which may beu'sed to eject practically anygrade of greases under extremely high pressure. A grease of very stringy and sticky consistencyA has jcome Yinto quitev general use, this grease being extremely dicultrtohandle in lubricant compressors.

this type of grease, as great facility,y i

A further object ofmy invention isvto provide an improved pneumatic means for priming the high pressure cylinder of a grease gun.vr

well asiother kinds, with A further object is to provide `an improved blow-olf and ventvalveffor use in pneumatically operated lubricant compressors.` y

A further object is to provide a grease gun witha high pressure ejecting means having improved means for lay-passing said means so that other ejecting means may be utilized in `v place thereof. 'f

A further object is to provide an improved means for latchingthe follower orA lowpressure piston in retracted position. i Y

A further object is Vto provide an improved high pressure grease gun of simplied constructionwhich may be economically manufactured andl which will be efcient and effective in operation.

A further object v is to provide, an improved telescopic discharge `nozzle lfor high pressure grease guns.

Other objects will appearfrom the following description, reference being had to the accompanying drawings, in which Figure 1 is a side elevation of my improved grease gun;

Figure .2 is a plan View of a discharge conduit and couplerusable nwith the grease gunV shown in Figure 1, a portion thereof being shown in section to illustrate the means for couplingthe conduit to the grease gun; Y,

V Figure 3 is a centraly longitudinal sectionof my improved telescopio discharge nozzle, and f Figure 4 is a central verticalsectional,viewof the grease gun shown in Figure 1, showing only the connecting portion ofthe discharge nozzle.

Referring'to.Figs.,1 and 4,'the grease gun of my invention comprises a cylindricalbarrel Iii. AOne end of the barrel is closed by aA-cap |2/having a neng@ I4 threaded witninthe pa-pre1, the

vthe barrel lil through alpassageway 24'.u

The cap is also provided with a threaded bore The 4compressor Y `of my invention, however, is capable of ejecting iV Claims. (o1. 2m-47.4)

cap' l2 being provided with an annular `groove l5 to receive the extremity of the barrel, suitable f UNITED STATES *PATENT* oli-ncsa f sealing means I8 being provided to prevent -leak- `age of air from the barrel. An air valve vtting 2li, which may be of any desired conventional "construction such as commonly used, on pneumatic-tires,A is threaded, in a bore 22 formed in the cap l2 andA communicates'with the interior o 26 which communicates with the interior ofthe barrel through a passageway28, theV end of the passageway 28 being'normally closed by'the'conical end portion 3i) of a vent valve lmember; 32.`

The member 32 is provided with a ventfopening 39. The conical portion' has a central airjiduct 34 which is normallyclosed by a valve 35.` The latter is yheld 'over the `Aend of theyduct 34 by a spring 38, one end of which, abuts against a backing member 40 for the valveli,` and the other end Vof whichjabuts against a sleeve l2 threadedgin the member 32. lThe `member `iii.

may be adjusted so as to vary the degree of compression of the spring 38. The valve thus serves as a blow-01T or safety valve to prevent excessive air-pressure within the barrel I0. -Themelnber 32 may be conveniently rotated by grasping the projecting ends of a pin 43 which extends dia-v metrically through the-member 32 is frictionally retained in place. I y

A piston, designated generally vas 4 4,` comprises -a pair of oppositely facing cup leathersi, `4 8, a

backing plate and ar pair (if-faceplates 52 andy i 54, all ofvwhich are mounted upon aAsleeveyfi,

being heldthereon by a nut 58 which is threaded,` over the end of the 'sleeve and Vholdstheniarts in assembled relationagainst a angeil formed at the other end of the sleeve. AThe sleeve-5 6 is `recessedto receiveV a packing 62, which is held in position by a packing lgland (i4` threaded inthe end of the sleeve; `The sleeve 56 surrounds'a ,pistonrod 66 which extends'through the ycap I2 pressing the latter against a conically tapered :surfacefi Iformed within ther packing gland :10.

4Thelocking ring serves as a means for holdingthe- .piston rodvvBB in its innermost positionfand for thisreason the `rmi is providedwithfa portion v78 of reduced diameter. When, as shown in Figure 4, the split resilient ring 14 is radially compressed, it lies within the annular space around the reduced -diameter portion'l and thus prevents the v piston rod 60 from appreciable longitudinal movement. A short tube 'I9v surrounding the piston rod 66 limits rearward Vmovement of the piston.

The end of the piston rod. 66 is vthreadedto receive .a vstop nut .80, which is adapted zto en-y gage with the sleeve '56 when the piston 44 is retracted by pulling outwardly on the piston .rod-

|50.-A The head end of the barrel I0 has a ring 82 threaded therein serving as a retainerlfor lther piston 44. A head casting 84 ofthe high pressure ejecting means has allange 186 .threaded .into 1 operable lever-.96. Thezouter end of ,the plunger 94 is foikedand rpivotally connected with the` lever 9B by a pin v98. VA pair of links |00 (only one shown) are pivotally .connected to the err-- .tremity .of the .lever 8B .and pivotally connected to a lug |02 formed integrally with .the head casting 84. l

The'head casting `passageway |06, which,=through av ductl I0, cornmunicates'fiwith `the v lower -end of theV cylinder S0 and with a valve kchamber |08.'V

An apertured valve seat of the `valve chamber |08, -is'normally closed by a ball valve ||4 whichis held against the seat by the cylindricalend projection ||6of afvalve actuator I8.l yA cup leatherV |20 encompassesa reduced end portion of the actuator H8 and is guided in the cylindrical bore of a bushing |22 which is threaded in a suitablehbos's formed on the head casting 84. A stem A|24 is threaded in ythe bushing |22 and is adaptedto press the valve vactuator |8 forwardly against the ball valve ||4 through `a' bearing plate |26, the stem being provided'with a Wing handle |28. A bushing |30is threaded in the discharge port |06 and has a cylindricalbore in whicha cup leatherV sealing member |32 is mounted for reciprocation. The Vcup leather is normally held in its leftmostiFig. 4)V position in engagement with an annular shoulder |34`by a compression coil`spring |36vretained within theb'ushing |30 by a flange r|38 spun inwardly at the inner extremity thereof. f

1 The grease gun above described may be used in conjunction with the discharge conduit shown in Fig. 2, or in conjunction with'the push type nozzle and high pressure Ycompressing means shown ingFig. 3, depending upon the type of lubricant-receiving fittings with which the compressor is to be used. Thejdischarge conduit shown in Fig. 2 Ais provided with-fa union fitting |40 lhaving a cylindrical projection |42 4engageable withthe face ofthe cup leather sealing.v member |32, the tting being heldinplace by a sleeve nut |44threaded over the end of the bushing |30. The fitting |40 is secured to a iiexible hose |48 by any suitable AYconnection kmeans and a couplerl |48 is secured to the free endof the hose |48. vThe. coupler vmay be'of any desired construction suitable for making a lubricant-tight connection witha lubricant-receiving fitting `and is illustrated as of the typeY shown in A. V. Gull- .'84 has a discharge outlet* l 1.2, formed 'at the end v the enlarged end of the cylinder |50.

'vtacts with the end of the tube 19.

lsuiliciently long that an adequate airspace will termined pressure.

borg Patent No. 1,307,734, granted June 24, 1919, for use in cooperation with so-called pin fittings, likewise disclosed in said patent.

When it is desired to use the lubricant compressor with fittings of the so-called push type ttings, as illustrated, for example, in the patent to O. Zerk, No'. 1,475,980, granted December 4, .1.923, ,the nozzle construction .shown -in Fig. 3 may be substituted for vthe discharge Aconduit shown in Fig. 2. The nozzle comprises a union telement |50 having a cylindrical projection |52l adaptedto be yprojected into the bushing |30,

and having its end face engaged by the sealing cup leather |32.

The element 50 .is provided with a valve seat ,|54 which'is vadapted to be closed by a ball valve |56. The element |50 is tightly coupled to the bushing |30 by a threaded sleeve |58. A high pressure cylinder |60 is threaded into the element |50 and has terminal projections |62 which prevent the end of the cylinder from being Vclosed bythe ball valve P56. A hollow plunger y|511 "is reciprocable in the bore-IGS-othe'cylinder |50. The plunger is tightly connected to a pipe extension |58, which carries anozzle tip |70. The nozzle tip-has the usual recess 1112 for making contact with theA lubricant-receiving iitting, and -is provided with a valve chamber N4 for 'retaining a spring-pressed ball" check valve |18 which vnormally closes the end of the pipe lextension |68.

vThe hollow plunger |84 has a'spring abutment |18 rigidly secured thereto for acompression coil spring |80, the other end -o which seats against arguide |82. The guide |82 presses against a sealing hat Washer |84 and is heldin place by a retaining sleeve |86, which is threaded into Y A telescoping sleeve |88v is mounted for sliding movement into the retaining sleeve |85 and is provided with an annular inwardly projecting stop shoulder |90, which is engageable bythe abutment |'|8to limit outward movement of the/hollow plunger |64. Cooperating stop shoulders |82 and |94 are also provided on the retaining sleeve |80 and telescoping sleeve |88, respectively, to

limit outward movement of the former relative to the latter.

'retracting the piston 44 by pulling outwardly on the handle 61.

During this operation, the vent valve 30 will be open so as to permit escape of air from the upper end of the barrel I0. `The piston will be Withdrawn until the face of the bushing G4 con- The tube is be maintained behind the piston 44, with the result that if airl is forced into this space at the pressure customarily available,k the air will expand and maintain pressure upon the piston throughout its discharge stroke suiciently rap- A idly to prime the high pressure cylinder.

Having iilled the barrel |0, it is again screwed "on'the head casting 84. The vent valve 30 is then closed and air is forced into the space becheck-valved nipple 20. Excesses of pressure within the barrel vI!) are prevented by the blow- 'oif valve 36, which may be adjusted to vent the any desired predebarrel to the atmosphere at Assuming that it is desired to lubricate bear-r ings equipped with the so-called pin fittings, the hose shown in Fig. 2 is connected to the nipple or bushing |30, the extremity |42 of the union fitting l 49 engaging the cup-leather sealingwasher |32, thereby effecting a lubricant-tight seal. When the compressor isto be used for supplying lubricant to pin-tting equipped bearings, the

check valve ||fi is rmly pressed against its seat 94 uncovers vthe port 92, whereupon the com-` pressed air behind the piston 44 will cause the latter rapidly( to force grease contained within the barrel l into the high pressure cylinder 90 to prime the latter.

n Whenit is desired to use the lubricant com-r pressor for the lubrication of a machine equipped with push type fittings, the telescoping nozzle shown in Fig. 3 is substituted for the flexible hose and coupler assembly. A lubricant-tight seal is effected by the engagement of the cup leather sealing washer |32 with the end face of the terminal portion |52 ofthe unionfltting |50. The

valve I4 is opened by unscrewing the valve stem 24, whereupon` lubricant may `flow directly un-y der the Vpressure of the compressed air within the barrel l0 past'the check,valve |56 into the high pressure cylinder |56. however, ordinarily not be suicienly high to cause flow through the hollow plungerr it andv past the spring-pressed check Valve |16. If there is any tendency of the lubricant to exude past the check Valve |76, the pressure in the `bar-- rel lll may be partially relieved by` opening the vent valve Sii for an instant. Lubricant is discharged from the cylinder |66 by pressing the nozzle |70 against the lubricant receiving tting and pushing the grease gun bodilyr toward said fitting. Such movement of the grease gun will cause a movement of the hollow plunger |64 into' the cylinder |55, thereby ejecting lubricant under high pressure past the check valve |'|6 into the bearing to be lubricated. yUpon return move ment of the grease gun, the spring |89 Will maintain the nozzle in contact with the tting, in readiness for the next discharge stroke.v The telescoping sleeves |88, |86', protect the spring against injury. The provision of these telescoping sleeves makes it possible to shorten the length of the nozzle assembly `by an amount equivalent to approximately half the stroke of the plunger |64. During the discharge stroke, the check valve |56 is of course forced tightly against its seat by the increased lubricant pressure and, of course, is forced away from its seat to permit ow of lubricant during the return stroke.

During the operation of the grease gun, the piston rod G is preferably locked in its innermost position by tightening the bushing 'l2 and thereby forcing the split ring '|4 tightly against the The pressure Will,A

' ment.

piston rod 66 at its Vportion 18 of reduced diamf eter. The handle 61 Vwill thus be rigidly connected to the grease gun proper andmay convenientlybe vused during the operation `of the i' grease gun, especially when the compressor is being vused for the ,lubrication of machines equipped with the push type lubricant-'receiving ttings.

While I have shown and described a particular. embodiment of my invention, it will be apparentV 'to those skilled in the art that various modifications in design and construction may be made without departing from the spirit of my inven-v tion.

Whaty I claim as new and desire to secure by Letters Patent of ,thev United States is:

l. In a portable high` pressure lubricantcompressor, the combination of a container for lubricant, means for maintaining the lubricant in said container under relatively low pressure,` high pressure discharge means connected to said container` and supplied with lubricant therefrom, Va discharge conduit for receiving lubricant from said last named means, a passagewayfrom said container to said discharge conduit; and amanually operable valve arranged to close said p-assageway, said valvev comprising a ball, a cylinder member, a reciprocable plunger having one end conformed to force said ball against the' valve seat, a threaded stem engageable with said plunger, and a cup leather in said cylinder preventing leakage. between said` plunger and the walls of said cylinder. n

2. A discharge nozzleA for high pressure lubricating apparatus comprising a4 cylinder, a tubular piston reciprocable in said cylinder, a spring for withdrawing said piston from said cylinder, and a pair of relatively telescoping sleeves sur- `roundingand enclosing said spring, one of said sleeves being secured to said cylinder and the other of said sleeves being slidable relative to said piston. y V

l 3. In a high pressure lubricant compressor, the

combination of .a source -of lubricant Vunder low pressure, a high pressure cylinder having lan in-l of said plunger, one of said sleeves being rigidlysecured to .said high pressure cylinder andthe other of said sleeves being slidably mounted upon Y said tubular plunger. Y

4. In a high pressure lubricant compressor, the

vcombination of la sourceof lubricant under low pressure, a high pressure cylinder having an inlet check valve, a tubular plunger having an abutment and reciprocable in said cylinder, a springengaging said abutment and acting thereupon to withdraw said plunger from said cylinder, and

a pair of relatively telescopic sleeves, oneof saidV l 'l yJOSEPH BYsTRI'CKY'. 

